CVE-2019-6231 in macOS
Summary
by MITRE
An out-of-bounds read was addressed with improved bounds checking. This issue is fixed in iOS 12.1.3, macOS Mojave 10.14.3, tvOS 12.1.2, watchOS 5.1.3. A malicious application may be able to read restricted memory.
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Analysis
by VulDB Data Team • 07/03/2023
The vulnerability identified as CVE-2019-6231 represents a critical out-of-bounds read flaw that existed within Apple's operating systems. This type of vulnerability falls under the category of memory safety issues and is particularly dangerous because it allows for unauthorized memory access that could expose sensitive data. The flaw was specifically addressed through enhanced bounds checking mechanisms that prevent applications from accessing memory locations outside their allocated boundaries. The vulnerability affected multiple Apple platforms including iOS, macOS, tvOS, and watchOS, indicating a widespread impact across the company's ecosystem. This issue demonstrates how memory corruption vulnerabilities can serve as entry points for more sophisticated attacks that may ultimately lead to privilege escalation or data theft.
The technical implementation of this vulnerability stems from inadequate input validation and memory boundary checking within Apple's system frameworks. When applications process data structures or user inputs, they must verify that accessed memory addresses remain within valid bounds. The absence of proper bounds checking in this case allowed a malicious application to craft inputs that would cause the system to read memory locations that should have been restricted or protected. This type of flaw is categorized as CWE-129 in the Common Weakness Enumeration system, which specifically addresses insufficient bounds checking. The vulnerability operates at the kernel level in many cases, making it particularly dangerous as it can potentially bypass user-space protections and access system-level memory regions that contain sensitive information such as cryptographic keys, user credentials, or system configuration data.
The operational impact of CVE-2019-6231 extends beyond simple memory access violations to represent a potential pathway for advanced persistent threats. Attackers could exploit this vulnerability by installing malicious applications on targeted devices, which would then leverage the out-of-bounds read to extract confidential information from restricted memory areas. This capability aligns with techniques described in the MITRE ATT&CK framework under the 'Memory Injection' and 'Privilege Escalation' tactics, where adversaries seek to gain access to protected memory regions to extract sensitive data or elevate their privileges. The vulnerability's presence in multiple Apple platforms means that attackers could potentially target users across different device types, increasing the attack surface and making the exploitation more versatile. Organizations and individuals who failed to update their systems to the patched versions would remain vulnerable to this type of memory-based attack vector.
Apple's response to this vulnerability involved releasing security updates that implemented improved bounds checking mechanisms across all affected platforms. The patches for iOS 12.1.3, macOS Mojave 10.14.3, tvOS 12.1.2, and watchOS 5.1.3 specifically addressed the memory access control issues by strengthening input validation and boundary checking routines. System administrators should prioritize applying these updates immediately, as the vulnerability represents a clear risk to data confidentiality and system integrity. The remediation process involves not just updating the operating systems but also implementing comprehensive monitoring to detect potential exploitation attempts. Organizations should consider deploying endpoint detection and response solutions that can identify suspicious memory access patterns or unauthorized application behavior that might indicate exploitation of similar vulnerabilities. This incident underscores the importance of maintaining up-to-date security patches and demonstrates how seemingly minor memory safety issues can have significant security implications when exploited by determined attackers.